Transformer data coupler with high common mode immunity

Details Transformer data coupler with high common mode immunity Transformer data coupler with high common mode immunity

2004-11-19

2008-09-09

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Cable systems and components

Transformer coupling

Reexamination Certificate

active

07424060

ABSTRACT:
A data coupler comprises two CMOS drivers which are supplied with a data signal and a delayed version of the data signal to drive a primary winding of a transformer with narrow pulses of opposite polarity corresponding to respective edges of the data signal. A secondary winding of the transformer is coupled via a low pass filter to a data receiver, with a ground path for ac from one end of the secondary winding. The drivers are scaled with a ratio (N−1):(N+1), where the transformer has a primary-to-secondary turns ratio of N:1 and N is greater than one, to equalize voltage drops in the drivers due to consequent unequal common mode currents in the drivers.

REFERENCES:
patent: 6087882 (2000-07-01), Chen et al.
patent: 6687286 (2004-02-01), Leonowich et al.
patent: 7203851 (2007-04-01), Lo et al.

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